<!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<head>
	<script>
		function fun () {
			console.log(arguments.length)
			console.log(arguments[2])
		}
		fun('a','b','c','d');
	</script>
</head>
<body>
</body>
</html>